过渡金属离子与头孢氨噻肟配位作用研究

Coordination Behavior of Claforan Towards Transition Metal Ions in Aqueous Solution

本文用ｐＨ电位法研究了在温度为２５±０．１℃，离子强度为０．１ｍｏｌ／Ｌ（ＮａＮＯ３）的水溶液中，过渡金属离子（Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）、Ｃｕ（Ⅱ）、Ｚｎ（Ⅱ）与头孢氨噻肟的配位作用，报导了溶液中头孢氨噻肟配体的酸解离常数和配合物形成的稳定常数．结果表明，溶液中金属离子与头孢氨噻肟配体主要以１∶１形式的配合物存在．

The formation and stability of the coordinate compound of transition metal ions (Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)) with claforan was studied by potentionmetric titrations in aqueous solution at temperature 25±0.1℃ and ionic strength 0.1mol/L (NaNO 3). Experimental data were analyzed by using the least squares computer program SUPERQUQD. The result shows that the metal ions form 1∶1 complexes (M(CE) +, M(CE)(OH)) with claforan.